bug#39360: Add :extend attribute to show-paren-mode expression face

[Clément Pit-Claudel]

On 2020-01-31 10:55, Eli Zaretskii wrote:
> What we have now is similar to how other
> programs behave, including highlighting of the space beyond EOL.  Does
> it irritate you in those other programs as well?

On my machine at least, none of vim, nano, or thunderbird highlights the EOL 
space.  

Firefox does highlight the end-of-line space on line wraps, but not when the 
newline is due to a paragraph change or an explicit <br /> in the source. 
LibreOffice and gedit highlight past the end of the line, stretching to the end 
of the window like Emacs does for the region.

If I highlight a region in LibreOffice using the highlighter tool to apply a 
background color, that color extends over one space to the right of the text 
when there's a line wrap (because the space over which the line is broken is 
before the break), but explicit newlines are not highlighted.

I couldn't find a program on my machine that behave like Emacs now does 
(highlighting explicit newlines).

Clément.